The Most Effective Way to Handle a Difficult Customer Complaint

The most effective way to handle a difficult customer complaint is to:

A) tell the customer you need to write down what they are saying, and then proceed to do so.
B) excuse yourself, and find a manager.
C) tell the customer that you will speak to them after they calm down.
D) raise your voice so that it is louder than the customer's, thus allowing you to take control of the situation.
E) tell the customer they will have to put their complaint in writing, and that nothing can be done until they do so.